0-2-2

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Stephenson's Rocket, an early 0-2-2 locomotive.
Stephenson's Rocket, an early 0-2-2 locomotive.

An 0-2-2, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one that has two coupled driving wheels followed by two trailing wheels, with no leading wheels .

Other equivalent classifications are:
UIC classification: A1 (also known as German classification and Italian classification)
French classification: 011
Turkish classification: 12
Swiss classification: 1/2


The 0-2-2 arrangement was used in the early days of the steam locomotive, and little thereafter. A famous 0-2-2 is Stephenson's Rocket. Its fellow competitor in the Rainhill Trials, John Ericsson and John Braithwaite's Novelty, was also an 0-2-2. Eight subsequent Stephenson locomotives for the Liverpool and Manchester Railway were of the 0-2-2 type; these were Meteor, Comet, Dart, Arrow, Phoenix, North Star, Northumbrian, and Majestic, following which Stephenson locomotives switched to the 2-2-0 Planet type. The pioneering American locomotive Tom Thumb was also of 0-2-2 configuration.


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Steam locomotive types
Single engine types
0-2-2 • 2-2-0 • 2-2-2 • 2-2-4 • 4-2-0 • 4-2-2 • 4-2-4 • 6-2-0
0-3-0
0-4-0 • 0-4-2 • 0-4-4 • 2-4-0 • 2-4-2 • 2-4-4 • 4-4-0 • 4-4-2 • 4-4-4 • 4-4-6
0-6-0 • 0-6-2 • 0-6-4 • 2-6-0 • 2-6-2 • 2-6-4 • 2-6-6 • 4-6-0 • 4-6-2 • 4-6-4
0-8-0 • 0-8-2 • 0-8-4 • 2-8-0 • 2-8-2 • 2-8-4 • 2-8-6 • 4-8-0 • 4-8-2 • 4-8-4 • 4-8-6 • 6-8-6
0-10-0 • 0-10-2 • 2-10-0 • 2-10-2 • 2-10-4 • 4-10-0 • 4-10-2
0-12-0 • 2-12-0 • 2-12-2 • 2-12-4 • 4-12-2 • 4-14-4
Duplex engine types
Garratt (articulated) types
Mallet (articulated) types
(includes Triplex)
0-4-4-0 • 0-4-4-2 • 2-4-4-2
0-6-6-0 • 2-6-6-0 • 2-6-6-2 • 2-6-6-4 • 2-6-6-6 • 2-6-8-0 • 4-6-6-2 • 4-6-6-4
0-8-8-0 • 2-8-8-0 • 2-8-8-2 • 2-8-8-4 • 4-8-8-2 • 4-8-8-4
2-10-10-2 • 2-8-8-8-2 • 2-8-8-8-4
Engerth (articulated) types
0-4-4 • 0-4-6
2-6-2 • 0-6-4 • 0-6-4-0
0-8-4 • 0-8-6